1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16b54cf3c7c00e49a6c220a6b323afc4fce0b266c3681cb1ee7090e7f06696c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b5c05cd-b529-4a95-85e4-a3c4c1f7e254.json and https://artists.proofprofile.net/proofs/artist/3b5c05cd-b529-4a95-85e4-a3c4c1f7e254.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5909211f68dc914c8b6508a1162755d8869a64c1eedb3840018cc6db6faf65. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81845584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634722c8b6c4939bd7903274360875f69ec17200e61d4b3755334a9a4d205730. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81845591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63fa365a09c5395f6977da1f20d465e38b8d8d1f0ccd1e046b699aba26c4029. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB42294537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8006468a2d7d6014139a9470e05358f18443528ac2d515bad105241d7bbde76a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES52380675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6950950b9d21bc29f5cbac7f1f8b191502e7d8dd3968c7a0689aa5cb0ffa9750. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES52380676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32d78e88a9c0eb4206c7da8b3712e4fa44c3519bbc46dd814c90bb240f2110e. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES52380679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bbb5cef50809d0b52c3f4824018f334fcf2e5b23787c5a7fd16913f1d2422f. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES52380680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8e367c58ff8f054b9abc81dc93b857916824bf48efdc3eabd57182d104a05e. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFQ2350906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a22f865479da926c5438516adf680be3ad5a9968bf8fb58a329258fbfd3c203. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52479372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594f86056e3226aa7dab7a40befa6fdfcf3a6b73701be47f850c5a5251c1e1c5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52479373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dad94fb56da975e3a031e4a661d46bccbfe9262d5d792a8351c3196fc6f4013. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52479376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de52ce7d9322d8fcf0f5d65a5d87a04c9dde261b669f4a969773a70d4e01efe. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES82599858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6afb98a18686bd69028a29dd0cb35f3679df1cc10a8d3d53e25f137bb45fa8f8. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEM2592847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de52ce7d9322d8fcf0f5d65a5d87a04c9dde261b669f4a969773a70d4e01efe. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES82599858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6afb98a18686bd69028a29dd0cb35f3679df1cc10a8d3d53e25f137bb45fa8f8. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEM2592847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa654c49941180d0949b0fb73c7476294bb58b28e521af0a0a0d814db4f6c7083. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2500821.